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This appears to be a mathematical equation for calculating the estimated glomerular filtration rate (eGFR) using the Cockcroft-Gault formula. The eGFR value is represented by cLcr. The equation takes into account the patient's age and weight in kilograms, as well as their serum creatinine level in milligrams per deciliter (mg/dL). The result may be used to assess the patient's kidney function.*